as the HH19ZA940 is specifically tuned for systems requiring this exact 55-degree differential to maintain safe airflow cycles

adjust the pilot key behind the adjustment cap on the valve body

This kit replaces legacy part numbers including GKT30020

Can this unit be used for liquid pressure monitoring

Advanced AF Technology: Features an electronic coil interface that handles large control voltage variations (24-60V AC/DC)

Trane SWT3179 Pressure Switch Kit Freon as the HH19ZA940 is specificallyFor veteran HVAC contractors, the Trane SWT3179 Pressure Switch Kitwhich is functionally identical to the SWT03179is a critical component for restoring furnace ignition sequences. This 0. 8" WC setpoint switch is a Single Pole Double Throw (SPDT) configuration, making it highly versatile for monitoring induced draft blower performance and ensuring proper venting before the gas valve opens. Engineering wise, this OEM replacement part is built for snap